Wikipedia:WikiProject U.S. Roads/Texas/All-time list

loops and spurs FM/RM roads

Highway Designation Files, official maps: http://www.tsl.state.tx.us/apps/arc/maps/ http://texashistory.unt.edu/search/ − −	−	−	−	−	−	−	−	− − − - −	- − − − Before 1939, the years of the first and last official maps the routes appear on are given. These are not always the exact years the routes were created or eliminated.
 * 
 * 1917
 * 1919
 * 1922
 * 1926
 * 1926
 * 1928(note that the 1928 map is actually March 1929 in the bottom right corner, but based on the A from 40A remaining on this other 1929 map, it's probably from after March)
 * 1929
 * 1932
 * 1933
 * June 1, 1934: not online yet.
 * September 1, 1934: not online yet.
 * January 1, 1935: not online yet.
 * 1935 (map 6192 on tsl.state.tx.us)
 * 1936
 * 1936
 * 1937
 * 1938
 * 1939

Note that maps after 1935 do not show all proposed routes. 1939* means that the route was probably created before the renumbering.